Spam comment

The commonest species on a growing channel is the impersonator: an account copying your name and picture, replying to your own commenters with a fake prize and a link to a Telegram group. The rest are link drops, engagement bait, and bots reposting the top comment word for word. YouTube filters some of this automatically. The remainder is your job, through Studio's community settings, where you can block words and links, hold comments for review, or hand moderation to someone else. Build the blocked-words list before you need it, because 20 minutes of setup beats an evening of deleting replies one at a time.